CVE-2021-29971 Security feature bypass in Firefox

What is CVE-2021-29971?

CVE-2021-29971 is a critical vulnerability in Mozilla Firefox, published on 5 Aug 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

If a user had granted a permission to a webpage and saved that grant, any webpage running on the same host - irrespective of scheme or port - would be granted that permission. *This bug only affects Firefox for Android. Other operating systems are unaffected.*. This vulnerability affects Firefox < 90.

Weakness: CWE-281

Which versions are affected by CVE-2021-29971?

It affects 1 product.

Products include Mozilla Firefox.

How do I fix CVE-2021-29971?

Upgrade to a fixed version.

Is CVE-2021-29971 being exploited?

There is no known exploitation of CVE-2021-29971 in the wild and no public exploit code.

Other vulnerabilities in Mozilla Firefox

• CVE-2019-11708 Mozilla Firefox and Thunderbird Sandbox Escape Exploited Critical 10.0
• CVE-2010-3765 Mozilla Multiple Products Remote Code Execution Exploited Critical 9.8
• CVE-2022-26486 Mozilla Firefox Use-After-Free Exploited Critical 9.6
• CVE-2022-26485 Mozilla Firefox Use-After-Free Exploited High 8.8
• CVE-2019-11707 Mozilla Firefox and Thunderbird Type Confusion Exploited High 8.8

All Mozilla Firefox vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-hmhq-whfw-x78q, UBUNTU-CVE-2021-29971.